Sewing machine



Sept 10, 1940- R. NAFTALI El AL 2,213,965

SEWING MACHINE Filed July 19, 1935 s Sheets-Sheet 1 nupd'dk filfiilVALENTINE NAFTALI 8: BY HENRY NAFTAL! a A? oRNEY p 10, 1940- R; NAFTALI;ET AL 2,213,965

snwmg uAcHniE I Filed July 19, 19:55 5 Shoots-Sheet z INVENTORS RUDOLFNAFTALI VALENTINE NAFTALI 8: BY HENRY NAFTALI.

A ORNEY Sept. 10, 1940. R. NAFTALI ET AL SEWING MACHINE Filed July 19,1935 Sheefw-Sheat 4 m was,

121-% C ORNEY Sept. 1-0, 1 940 R. NAFTALI ET AL sawme MACHINE Filed July19, 1935 5 Sheets-Sheet 5 Patented Sept. 10, 1940" SEWING MACHINE RudolfNaftali, Valentine Naftali, and Henry Naftali, Bronx, N. Y, assignors,by mesne assignments, to American Machine 8; Foundry .(IIompany, NewYork, N. Y., a corporation of New ersey Application July 19, 1935,Serial No. 32,148

12 Claims.

dle having its eye located between the points, I

the opposite ends of which are grasped alternately by the jaws ofopposed needle" bars arm ranged in alignment.

One object of our invention is to provide a machine of the characterdescribed, having improved threading mechanism by means of which E weare able to quickly thread the needle.

Another object of our invention is to provide a machine of the characterdescribed having improved thread holding means making it unnecessary forthe operator to secure or release the thread.

Another object of our invention is to provide a machine of the characterdescribed in which the thread is prevented from becoming entangled andthereby broken, during the stitching operation.

Another object of our invention is to provide a machine of the characterdescribed, having improved looping mechanism.

Still another object of our invention is to provide a machine of thecharacter described, having means to facilitate the quick removal andreplacement of the needle.

A further object of our invention is to provide a machine of thecharacter described in which the free end of the thread that is wound onthe drum is prevented from becoming entangled with adjacent strands ofthread wound on the drum.

A further object of our invention is to provide a machine of thecharacter described having improved work feeding mechanism.

Another object of our invention is to provide a machine of the characterdescribed, having means whereby the needle on its down stroke is assuredagainst piercing and therefore -.-breaking the thread.

- Still another object of our vide a machine of the character describedhaving automatic means for starting the tie stitching operation and forstopping when the tie has 50 been completely stitched.

Other objects of this invention will in part-be obvious and in parthereinafter pointed out;

,The invention accordingly consists in the feae tures of construction,combinations of elements, and arrangement of parts which willf'beexembodying our invention;

invention is to .pro-

plifled in the construction hereinafter described, and of which thescope of application will be indicated in the following claims. r In theaccompanying drawings, in which is shown one of the various possibleillustrative embodiments of this invention:

Fig. 1 is a plan view of the assembly of the apparatus embodying ourinvention;

Fig. 2 is a view similar to Fig. 1 but in side elevation; v

Fig. 3 is a side view of a portion of the apparatus, partly sectional,disclosing some of the features of our invention;

Fig. 4 is a detail view of a clutching mechanism employed in ourinvention;

Fig. 5 is an'enlarged view in section of one of the details of ourapparatus;

Fig. 6 is a view in section, taken substantially on the line 6-6 of Fig.5;

Fig. '7 is a front view similar to Fi 3;

' Fig. 8 is a view in detail of a portion of apparatus shown in Fig. 7;

Fig. 9 is a view in section, online 9-9 of Fig. '7;

Fig. 10 is an enlarged detail, in section, of a portion of our apparatusillustrating one of the elements of the operation of the mechanism emthetaken substantially detail in section of a por- Fig. 11 is an enlargedillustrating another eletion of our apparatus ment of the operation ofthe mechanism emin elevation of aportion element of the operation of themechanism embodying our invention taken substantially on the line l5-l5of Fig.'.14;

Fig. 16 is an enlargeddetail in section of a portion of our apparatusment of the operation of the mechanism embodying our invention;

Fig. 1'7 is a detail view in section, taken substantially on the line"-41 of Fig. 16; and

Fig. 18 is a wiring diagram illustrating one feature of our invention.

- Referringfto the drawings, wherein we have illustrating' anothere1efirst describe the operation of the driving mechanism by means ofwhich the needle iscaused to be alternately grasped by the jaws of theupper and lower needle bars. There is provided suitable driving meanssuch as a motor M, supported on a bracket 25. Mounted on motor shaft 26is a gear 27 meshing with a gear 28 which is mounted on shaft 29,suitably supported as shown, said shaft 29 having also mounted thereon apulley 30. Pulley 30 may be made to drive pulley 32 by means of a belt3I. Pulley 32 is freely supported on a fixed, nonrotatable shaft 33which is held in a support 34 fixed to the casing C. Positioned betweenpulley 32 and shaft 33 there is provided a collar 35 integral with andextending laterally from pulley 32, said collar being adapted to rotatefreely on shaft 33. Mounted on said collar 35 for rotation therewith isa gear 36, cam 31 and cam 38. By this construction it is seen that cams37 and 38, and gear 36 are integrally connected to move as a unit whenpulley 32 is driven by the belt 3|. Said cams 31 and 38, as well as gear36 are fixedly mounted on collar 35 which is designed to rotate freelyabout shaft 33. Gem 38 is provided with an annulargroove in whichrollers 39 are guided, said rollers being mounted on shafts 46 fixed toplate It is seen from the above construction that plate 4| will becaused to oscillate'with a predetermined regularity in accordancewiththe path of the annular groove in cam 38. This predetermined degreeof oscillation of plate 4| may be made to be of the same amount asdesired for the oscillation of upper needle bar 50 and lower needle bar5| to alternately clutch the double pointed needle 52 after it haspierced the material to be stitched. The oscillatory motion of plate IImay be transmitted therefrom to needle bars 50 and 5I by means such asrocker arms 53 and 56 pivoted to the casing at 55 and 56, respectively.Rocker arm 53 is connected to needle bar 50 by means of a link 51 and toplate M by means of a link 58, while rocker arm 54 may be connected tolower needle bar 5| by means of a link 59, and to plate 4I by..means ofa link 66.

. During the operation of our apparatus, as fully described in ourPatent No. 1,931,447, it was found that much time was lost by theoperator in the threading of the needle and in securing one end of thethread in a fixed position until the stitching of the tie had beencompleted, at which time the thread had to be released by'some meanssuch as cutting with a knife or breaking.

We have therefore devised a novel mechanism by means of which the needlemay be quickly threaded, after which one end of the threadis.automatically grasped and held until the stitching of the tie hasbeen completed,

at which time the held thread is then auto-.

matically released. The mechanism by which we accomplish this may bedescribed as follows:

A threader 65 (see Fig. 3) having a threading hook 66 at one end and ahandle I6Iv at the other end, is pivotally mounted on a shaft I68 fixedto upper rocker arm 53. By this construction it is seen that hook 66,which is adapt ed to pierce the eye of the needle 52 to thread it, willalways be in proper position to pierce the eye of the needle 52 whensaid needle is clutched by the upper needle bar 50'. This is due to thefact that shaft I68 about which the.

hook 66 is pivoted is caused to move with neesition to prevent tangling.

tion, and more particularly to Fig. 3, we will dle bar 50 to maintain aconstant distance between shaft I68 and the eye of the needle.

In Figs. 16 and 1'7 of the drawings we have shown the hook portion 66 ofthreader 65 after it has been swung around to pierce the eye of theneedle 52. Thread T which is shown looped over the hook, is ready to bethreaded in the eye of the needle.

By referring to Figs. 3. and 15 it will be noted that a pair of jaws 61and 68 of a grasping device III supported on'the'machine casing, areshown held in efiective or closed position by the action of a spring II,whereas in Fig. 16 it is seen that when the threader hook 66 has beeninserted through the eye of the needle, the jaws 61 and 68 of thegrasping device II! have been forced open by means of a cam 69 rotatablymounted on threader 65 and adapted to ride on lower jaw 68 to force saidjaw 68 downwardly against the action of spring II. As the threader 65 ispulled back to be withdrawn from the eye of the needle, hook 66 carriesone end of the thread through the eye of the needle to thread the sameand thence between the opened jaws 61 and 68. At the same time cam 69allows lower jaw 68 to resume its normally closed position to grip thethread T between the teeth of the upper and lower jaws 61 and 68 to holdsaid thread in a fixed position. One end of thread T is thus held fixedfor a predetermined time, such as when the tie has been completelystitched, when it is automatically released. We have provided thefollowing means for automatically releasing the held thread at suchpredetermined time. A vertical plate I2 is mounted on an intermittentlytraveling work carriage I3. The mechanism by which this work carriage ismoved will become apparent as the description proceeds. Attached toplate I2 is a track I4 inclined with respect to the horizontal andsuitably positioned and adapted to have a roller I5 ride thereon, saidroller I5 being rotatably mounted to the extended end of lower jaw 68(see Fig. 16). Lower jaw 68 is made to pivot about an axis I6. When thework carriage I3 travels in the direction of the arrow (Fig. 7) for apredetermined distance, roller I5 will ride on inclined track I4 tocause lower jaw 68 of the grasping device 10 to automatically releasethe thread T.

In stitching machines of the type described, wherein a looper isemployed and where the loose end of the thread is pulled-through thework after the completion of each stitch, it is particularly desirableto provide means to prevent the two strands of the thread cooperatingwith the needle and the work from becoming intertwined or entangled.Should the thread become entangled the looper or the thread puller wouldtend to engage both strands of thread, and since one end of the threadis held fixed it would be broken thus causing delay and inefiiciency. Toobviate this disadvantage we have devised novel thread holdingmechanisms designed to constantly maintain the thread in po- We willfirst describe the operation of our thread holding mechanism as appliedto the needle when said needle is connected to the upper needle bar 50.Then the operation of the mechanism which we employ to hold thethread'when the needle is connected to the lower needle bar 5I 'will'bedescribed.

In Figs. 7 and 8 of the drawings there is disclosed upper needle bar 50slidably operating in the frame 0, said frame having attachedthereto 76I to bracket 88 at a point 82. Arm 8| may be held pressed intoengagement with needle 52 by suitable means such as an adjustable'spring- 83. A 7

stop 84 fastened to the frame of the machine is provided to limit thepressure of arm 8| against the needle 52 to prevent breaking of theneedle. On the opposite 'side of the needle 52 from that of arm 8| weprovide another arm 88, pivotally mounted on the machine casing at 81and held in engagement with needle 52 by suitable means such as a spring88. 8| is provided with a cam portion 85 ada ted to cooperate with aprojecting lug 89 fixed to needle bar 58.

When the needle bar 58 is in raised position, as

' shown in Fig. 7, arms 8| and 88 serve to maintain the strands of thethread in proper alignment to prevent entanglement. When needle bar 58moves downwardly a wedge-shaped needle chuck.

98 fixed to the =lower end of needle bar 58 acts so as to move arm 86away from needle 52 against the action of spring 88 while at the sametime lug 89 contacts the cam portion 85 to move arm 8| away from theneedle against the action of spring 83. Thus it is seen that arms 8| and88 are caused to be spread apart to free the thread for effective use topermit the thread to be acted upon by a specially designed looper whichwill be described in detail as the description proceeds. When needle bar58 returns upwardly, arms'. 8|

and 86 re-engage the needle 52 to hold the strands of the thread.

Another thread holding mechanism is also provided to hold the strands'of the thread when the needle'is connected to the lower needle barReferring to Fig. 3, there is disclosed a cam member 9| fixed to rockerarm 54. Cam member 9| is provided with a slotted portion 92. A link 93is pivotally connected to the machine casing at a point 94, said link 93having fixed thereto a pin 95 adapted to engage the slot 92 to causelink 9| to travel in an oscillatory path about pivot 94 whenever rockerarm 54 is moved. A forked member 96 is pivotally attached to link 93 at91 at one end, and to a link 98 at a point 99. Link 98 is pivoted to themachine casting at I88, as shown in detail in Fig. 10. Forked member 96has extension arm members which are adapted to straddle and pressagainst the needle 52 at opposite sides thereof to maintain the threadin proper alignment to prevent entanglement.

Cam member 91 is so designed as to maintain the lower thread holdingmechanism, as just described, in effective position until such time asthe thread is acted upon by a specially designed thread puller, similarto that shown and described in our Patent No. 1,931,447 and which willbe discussed more fully as the description proceeds.

To further increase the efiiciency of operation of our stitchingmachine, we have devised a novel mechanism which we call a looper, theoperation of which will now be explained. Referring first to Fig. 7 ofthe drawings, there is disclosed a looper I85 one end of which ispivotally.

mounted to the machine casingat a point such as I86. Journaled in saidmachine casing is a shaft I81 (see also Fig. 1) having mounted thereonat one end'a link I88. Said link I88 is connected to looper I85 by meansof a link I89 one end of which is pivotally fastened to looper I85 at apoint such as II8, the other end being pivotally connected to link I88at III. Thus it can be seen that when shaft I81 is rotated looper I85will be caused to oscillateabout pivot I88. The degree and regularity ofthis oscillation may be governed by rotatably mounting on shaft 4 aroller 2 adapted to ride on a cam 31 and rigidly connected to shaft I81by a link 5. The contour of cam 31 may be such as to cause looper I85,through the linkage system just described, to oscillate about pivotv I88at predetermined intervals to engage the loose end of the thread to forma loop. Looper I85 may be caused to pull the loose end of said thread byany suitable hook means such as spoollike projection 6 (see Fig. 3).From the above description of the operation of the looper it becomesapparent that the loose endof the thread T is prevented from becomingentangled and broken when the needle 52 is shifted from the upper needlebar, as in Fig. 7, to be clutched by the lower needle bar as shown inFig. 10. The mechanism for operating the looper I85 just described isdesigned to act in cooperative relation with the thread holding meanshereinbefore described in connection with the upper needle bar 58.

The mechanism which we employ in our improved apparatus to engage theloops as they are formed from the thread in stitching and to draw orpull out the free end portion of the thread after each stitch may besimilar to that shown and described in our Patent No. 1,931,447,hereinbefore mentioned. The operation of the above-described mechanismwill be clearly understood Home study .of Figs. 3 and '7 of the drawingsin which it is seen that gear 38 is mounted for rotation with pulley32,. and that when said gear 36 is rotated it causes a thread puller I28to be carried in a circular patharound the periphery of a stationarygrooved drum IN, by means of a chain of gears I22 (Fig. 3), I22, I23 andI24.

The following mechanism may be employed to cause thread puller I28 totravel in its circular path: Gear I24 is so mounted that it is ineccentric relation to the axis of the grooved drum I2I. Fixed to gear I24 for rotation therewith is an annular plate I24. The thread puller I28is fixed to the outer end of a carrier arm I25, said carrier. arm beingpivoted at its inner end to the drum |2| at a point I28 coincident withthe center of said drum I2I. Carrier arm I25 is provided with alongitudinal slot I21 into which a block I28 fixed to the outeer edge ofannular disc I24 is adapted to slide. Thus it is seen that when gear I24is rotated, the thread puller |28.is caused to travel around drum I2I.The mechanism for operating the thread puller as just described isdesigned to act in cooperative relation with the thread holding meanshereinbefore described. in connection with the lower needle bar 5|.

The function of the stationary circular grooved drum I2| is similar tothat shown and described in our Patent No. 1,931,447. Briefly stated itis to support the loose portion of the thread on the periphery of saiddrum |2| after the said thread has been pulled out from the fabric bythe thread puller -I28. Figs. 11' and 13 clearly illustrate two steps inthis action. Drum I2I may be provided with grooves I29 as shown in Fig.12, to prevent entanglement of adjacent strands. of the thread whilethey rest on said I2 I. and into grooves I29, we have devised a novelthread holding means which may comprise a plurotate wheel rality ofbrushes I held in engagement with grooves I29 of the drum I 2I by meansof adjustable springs I3I (see Fig. 9). Brushes I30 are pivotallyfastened to the machine casing at suitably positioned points, such as atI32. These brushes I30 serve to hold the thread in its own groove on thedrum I2I to prevent sagging and resulting entanglement. The looper I20is adapted to readily pass through the brushes I30 as it travels in acircumferential path around said drum.

We have also devised a simplified and more efficient mechanism thanheretofore employed for intermittently advancing the platformcarrying'the fabric to be stitched.

By referring to the drawings, the operation of the above mentionedmechanism will be clearly understood. In Fig. '7 we have disclosed aportion of the work carriage or the traveling platform I3 adapted totravel along any suitable guide means or tracks, such as shown anddescribed in our Patent No. 1,931,447. On the underside of said platformI3 there is provided a toothed rack I35. On a shaft I31 fixed to themachine casing C we mount a gear I36 designed to mesh with .said. rackI35. The means by which gear I36 may be intermittently rotated tointermittently advance the platform I3 may be described as follows: Onthe shaft I3I we also mount a notched wheel I38 having a series ofspaced notches I40 arranged circumferentially of said wheel I38. Mountedfor rotation with gear I22 is a cam member I4I having an extendedportion I42 adapted to cooperate with slots I40. Cam member MI is sodesigned that with each revolutionthereof the extended portion I42 willsuccessivelyengage a slot I40 to I38 a predetermined amount. Wheel I38will then rotate shaft I31 and gear I36 mounted thereon to advanceplatform I3 a predetermined distance in the direction shown by thearrow. Gear I22 is mounted on the same shaft as gear I22 and rotatestherewith. Gear I 22 is driven by gear 36 which in turn is fixed to thepulley 32 for rotation therewith. The mechanism just described is sodesigned as to cause platform 13 to travel a predetermined amount aftereach stitch.

It is well known by those familiar with the art that the needle employedin machines of the type described must be occasionally changed forvarious-reasons. It is desirable, therefore, that this be done asquickly as possible. To facilitate the quick removal and replacement ofthe needle, we have devised a mechanism which will now be described.Referring first. to Fig. 5, we have shown an enlarged view in sect-ionof the mechanism of the upper needle bar to which is screwed at itslower end a tapered chuck 90. Within the hollowed interior of chuck 90we provide three balls B (see Fig. 6) arranged so as to permit needle 52to be inserted between them and held thereby. When the balls B arepressed downwardly the tapered portion of chuck 90 forces them togetherto grip the needle 52.

Thisdownward pressure is applied by means of a spring I50 pressingagainst a shank I5I whichin turn presses on the ball B. The upper end ofsaid spring I50 abuts against a member I52 screwedinto the top portionof needle bar 50.

The upper end of" shank I5I extends through.

-ing the rotation of pulley 32. hand wheel 39 is rotated in a counterclockwise description that when the stop I53 is raised in the directionof the arrow while needle bar 50 is held stationary, it will carry withit shank ISI. This will act so as to release the pressure on balls B toallow the needle 52 to be easily removed and replaced. Any suitablemeans for raising the stop I53 may be employed, such as a forked handleI55 (Figs. 7 and 8) pivotally mounted in a frame I56 fixed to themachinecasing C. When handle I55 is pressed downwardly the lower forked end ofsaid handle will engage the underside of stop I 53 to raise the same andthereby release needle 52 in the manner just described- It has beenfound in the course of the operation of stitching machines of thecharacter described where the upper and lower needle bars are inaligim'ient that occasionally the thread would be found to overlie thehole of the lower chuck so that when the needle travels downwardly to begrasped by the lower chuck it is apt to pierce the thread whichinterrupts its path, to break said thread. This obviously causes a delayinasmuch as it then becomes necessary for the operator to stop themachine and rethread the needle and start all over again.

- chuck 90' but will tend to slide down to either side due to thepointed construction as well as the positioning of the needle hole. 7

When operating machines of the character described by power means, suchas a motor, it has been found desirable at times for certain reasonssuch as making trial stitches, to operate the machine by hand. The meansby which we accomplish this in connection with our apparatus may bedescribed as follows: Positioned within the central portion of pulley 32is a clutch mechanism I60 shown in detail in Fig. 4. This mechanismoperates on a principle similar to that used in free wheeling devices. Adisc member I63 of the clutch I60 is rigidly attached to a collar I6Iwhich idles on shaft 33. A plurality of spaced notched portions I62 arecut out of the circumference of disc I63. Into these notches are fittedrollers I 64. It will be noted that disc I63 is of lesser diameter thanthe interior opening in pulley 32, thus permitting said disc I63 torotate freely within the pulley 32. Fastened to the disc portion I63 ofthe clutch I60 at one end is a hand wheel 39 as shown in Fig. 3, adaptedto rotate with said disc I63.

It will be seen from the above described construction that whenever thehand wheel 39 is rotated in a clockwise direction as indicated by thearrows in Figures 3 and 4, the rollers I64 will be held in notchedportions I62 and disc I63 will be permitted to rotate freely withoutaffect- However, when the direction opposite to that shown by the arrowsin Figures 3 and 4, rollers I64 will then be freed from the notchedportions I62 to engage the inner surface of pulley 32 to lock disc I63to said pulley for rotation therewith. Thus it is seen that whenever itis desired to operate the stitching machine by hand, it is merelynecessary to turn the hand wheeel in a direction opposite to that shownby the arrows in Figures 3 and 4 and in so doing; the machine willoperate similarly to that of the operation when power means is used.

Should it be desired to operate our apparatus automatically, we haveprovided an automatic switching mechanism adapted to close a circuit tostart the motor when a'lever mechanism is tripped and to cause saidcircuit to be broken to stop the apparatus when the work platform hastraveled a predetermined distance.

In Fig. 18 we have shown a wiring diagram illustrating one means foraccomplishing this result. When lever I10 is turned in the direction ofthe arrow B, a catch mechanism I'll is tripped to close the contacts I12of the switch S by means of a spring R in order to complete a circuitfrom a source of current supply through the motor M which is energizedto cause platform I3 to travel in the direction of arrow A. Fastened toplatform 13 and traveling therewith is a projecting lug I13 adapted tostrike againsta projecting portion S of switch S. Lug I13 may bepositioned at'a predetermined distance from the projecting portion ofswitch 8', such for example as is necessary for the complete stitchingof a tie. When lug I13 strikes projecting portion of switch S, contactsI12 are opened against the action of the spring R to'break the circuitand stop motor M. The lever I may then be made to reengage catch ill tohold contacts I12 open until it is desired to operate the machine tostitch another tie.

It will thus be seen that there is provided a device in which theseveral objects of this invention are achieved, and which is welladapted to meet the conditions of practical use.

As various possible embodiments might be made of the above invention,and as various changes might be made in the embodiment set forth, it isto be understood that all matter herein set forth or shown in theaccompanying drawings, is to be interpreted as illustrative and not in alimiting sense.

We claim: l

1. In a sewing machine, the combination of alternately operating needlebars, a support for said needle bars, a needle, means to alternatelyconnect the needle with each needle bar, means for threading the needle,said last named means being mounted directly on one of said needle barsfor movement therewith, means for securing one end of a thread for theneedle, and means whereby said needle threading means actuates. saidthread securing means.

2. In a sewing machine, the combination of a needle, a needle barcooperating with said needle, a support for said needle bar, means forthreading the needle, said last named means being mounted directly onsaid needle bar for movement therewith, means forsecuring one end of athread for the needle; and means whereby said needle threading means iscaused to actuate said thread securing means.

3. In a sewing machine, the combination of a needle, a needle barcooperating with said' needle, a support for said needle bar, means forthreading the needle, means forsecuring one end of a thread for theneedle, a traveling work supportingv platform, means wherebysaid needlethreading means is caused to actuate said thread securing:

means to secure said thread, and means whereby said thread securingmeans is actuated to release said secured thread after said platform hascuring one end of a thread for the needle, 9. traveling work supportingplatform, means whereby said needle threading means is caused to actuatesaid thread securing means to secure said thread, and means whereby saidthread securing means is actuated to release said secured thread aftersaid platform has traveled a predetermined distance, said last namedmeans being supported onsaid platform.

5. In a sewing machine, the combination of a needle, a frame, a needlebar mounted on said frame and adapted to cooperate with saidneedle','said needle bar having a shoulder adjacent its upper end,manually manipulatable means associated with one of said needle bars forquickly disconnecting the needle from said needle bar comprising ahandle pivotally mdunted on said frame adapted to engage the undersideof said shoulder of said needle bar to raise the same, and means wherebysaid needle is caused to be released when said needle bar is raised bysaid handle.

6. In a sewingmachine, the combination of alternately operating needlebars, a support for said needle bars, a needle, means to alternatelyconnect the needle with each needle bar, a thread threaded through saidneedle and having one end secured and the other end free, said needleand needle bars adapted to form successive loops in the thread, a pullerfor engaging said successive loops away from the needle and pulling outthe free portion of the thread, means for driving said secured and theother end free, said needle and needle-bars adapted to form successiveloops in the thread, a puller for engaging said successive loops awayfrom the needle and pulling out the free portionof the thread, means fordriving said puller, a stationary drum cooperating with said puller andadapted to receive said free portion of the thread thereon to prevententanglement of said free end of thread, and means cooperating with saiddrum to hold said free end thread portions thereon, said last namedmeans comprising a brush adapted to be held in resilient engagement withthe periphery of said drum.

8. In a sewing machine, the combination of alternately operating needlebars, a support for said needle bars, a needle, means to alternatelyconnect the needle with each needle bar, a thread threaded through saidneedle and having one end.

the thread, a puller for engaging said successive loops away from theneedle and pulling out the free portions of the thread, means fordriving said puller, a stationary drum cooperating with said puller andadapted to receive said free portion of the "thread thereon to prevententanglement of said free end of thread, and means cooperating with saiddrum to hold said free end thread portions thereon, said last namedmeans comprising a brush adapted to be held in resilient engagement withthe periphery of said drum, said drum being provided grooves.

9. In a sewing machine, the combination of alternately operating needlebars, a support for said needle bars, a needle, means to alternately.

connect the needle with each needle bar, a traveling work supportingplatform, means timed with the alternately operating bars forintermittently advancing the platform, said means comprising a gear rackmounted on said platform, a gear cooperating with said rack, said gearbeing mounted on a shaft for rotation therewith, a wheel having aplurality of notches arranged circumierentially thereof and mounted onsaid shaft for rotation therewith, and means for successively engagingsaid notches to cause said wheel to rotate inter mittently.

10. In a sewing machine, the combination of l alternately operatingupper and lower needle bars. a support for said needle bars, a needle,means to alternately connect the needle with each needle bar, a threadassociated with said needle, each of said needle bars being providedwith a substantially cone shaped chuck having a hole therein adapted topermit the needle to enter to be connected thereto, said upper and lowerneedle bar holes being in alignment, the hole in said lower needle barbeing eccentric with respect to the apex of said cone whereby saidneedle is adapted to travel from said upper needle bar to said lowerneedle bar without piercing said thread to break the c 2,213,965 withcircumferential 11. In a sewing machine adapted to sew threads ofpredetermined length, the combination of alternately operating needlebars, a support for said needle bars, a needle, means to alternatelyconnect the needle with each needle bar, and

means for threading the needle, said last named means comprising a rigidmember having one end thereof pivotally mounted on one of said needlebar and having the free with a.- hook adapted to pierce the eye of theneedle, the radius of pivotal movement of said hook portion beingsubstantially equal to the distance between the pivotal axis of saidmember and the eye of the needle.

one end thereof and adapted upon pivotal move-- ment of said pivotallymounted member to slidably move said spring pressed member against theaction of its spring.

end thereof provided CERTIFICATE OF CORRECTION.- Patent No 2,215,965.September 10, 191m.

RUDOLF. NAFTALI, ET AL.

It is hereby certified that error appears in the printed epecification'of the above numbered patent requiring correctionas'follows: Page 6, secbnd column, line 9, claim 11 for the word "bar" read bars--; line 20,

claim 12-, before "relative" insert ----movable-'-; and that the saidLetters Patent shouldbe reed with this correction therein that" the samemay confem to the record of the case in the Patent Office. v [si nedend. eealed. this 5th day of November, A. 1). 191m.

Henry Van Arsdale,

Acting Commiesioner of Patents. (Seal)

